It's a mix. General terms will be usually in Polish, in some older textbooks or other materials you can encounter really different terms that relate to differen

It's a mix. General terms will be usually in Polish, in some older textbooks or other materials you can encounter really different terms that relate to different era. Things like "Zbiór danych" (or just "zbiór") instead of "plik" - which translate to "data set" Vs "file"